September in Las Cruces averages a daily high of 31.6°C with nights around 16.5°C. Expect roughly 5 wet days totalling 34.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Las Cruces is March–April.
Based on STATE UNIVERSITY, NM US (3.8km), 1995–2024. 30 years of September data.